The Use of Hard Alloy Waste in Composite Galvanic Coatings for the Restoration of Car Parts

Abstract

The results of the research of the use of powders based on tungsten carbide with a particle size of 1 μm or less, obtained by the method of electro-erosion dispersion from the waste of sintered hard alloys, as a dispersed phase of composite galvanic coatings based on iron during the restoration and hardening of car parts are presented. It is shown that the introduction powders of hard alloys of grades VK8 and T15K6 in the chloride electrolyte of iron plating with a concentration of 100 g/l and more, practically does not affect the micro-hardness, but allows to increase the relative wear resistance of the obtained composite galvanic coatings, compared to simple iron galvanic coatings, and, at the same time, increase the life of parts and reduce repair costs.

Remanufacturing and Advanced Machining Processes for New Materials and Components

“…Application of powders based on tungsten carbide with a particle size below 1 μm, produced by electro-erosion dispersion from waste-sintered hard alloys as a dispersed phase of composite galvanic coatings based on iron during restoration and hardening of car parts, is possible. The resulting micro-hardness was close to that of the original component, while relative wear resistance of the obtained composite galvanic coatings was increased compared to simple iron galvanic coatings (Semenikhin et al, 2020). It is noteworthy that not only waste materials are reused and worn parts repaired at reduced costs, but also life of repaired parts is increased.…”

“…Another method of hard coating deposition is associated primarily with restoration of car parts, namely the technology of electrodeposition of composite galvanic coatings (CGC) (Semenikhin et al, 2020). The essence of the CGC method is precipitation of a metal from the galvanic bath, together with various powders deposited on a part, such as metals, oxides, carbides, borides, and sulfides, as well as polymers.…”

“…Among advantages of the method, comparative ease of coating disposal directly on the part surface, the low cost, the possibility of the process automation, and only slight influence of coatings on material properties of parts can be mentioned. Semenikhin et al (2020) emphasize that CGC can be realized in various ways, most often from a galvanic bath. The simplest version comprises an electrolyte poured into the bath and mixed with powder, a detail fixed on the cathode, and…”